package ProduceAndconsum;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @projectName: JUC
 * @package: ProduceAndconsum
 * @className: B
 * @author: 冷环渊 doomwatcher
 * @description: TODO
 * @date: 2022/3/1 21:31
 * @version: 1.0
 */


public class B {
    public static void main(String[] args) {
        Data2 data = new Data2();
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                try {
                    data.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "A").start();
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                try {
                    data.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "B").start();
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                try {
                    data.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "C").start();
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                try {
                    data.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "D").start();
    }
}

//数字 资源类
// 1、 判断等待，通知
class Data2 {
    private int number = 0;
    Lock lock = new ReentrantLock();
    Condition condition = lock.newCondition();
    //等待
    //    condition.await();
    //唤醒全部
    //    condition.signalAll();

    //    +1
    public void increment() throws InterruptedException {
        lock.lock();
        try {
            while (number != 0) {
                //    等待
                condition.await();
            }
            number++;
            System.out.println(Thread.currentThread().getName() + "=>" + number);
            //    通知其他线程 +1 完毕了
            condition.signalAll();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    //    -1
    public void decrement() throws InterruptedException {
        lock.lock();
        try {
            while (number == 0) {
                //    等待
                condition.await();
            }
            number--;
            System.out.println(Thread.currentThread().getName() + "=>" + number);
            //    通知其他线程 -1 完毕了
            condition.signalAll();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
}